<template>
   <div>
     <!-- 面包屑导航区域 -->
      <el-breadcrumb separator="/">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item>
        <el-breadcrumb-item>参数列表</el-breadcrumb-item>
      </el-breadcrumb>

    <!-- 卡片视图区域 -->
     <el-card>
       <!--警告区域 -->
        <el-alert
            title="注意：只允许为第三级分类设置相关参数!"
            type="warning" show-icon :closable="false">
        </el-alert>

        <!-- 选择商品分类区域 -->
        <el-row class="cat_opt">
           <el-col>
               <span>选择商品分类:  </span>
               <!-- 选择商品分类的级联选择框 -->
               <!-- options数据源 -->
               <!-- props 指定配置对象 -->
               <!-- v-model 选中的key值 也是级联选择器双向绑定的数据 -->
                <el-cascader
                    v-model="selectedKeys"
                    :options="cateList"
                    :props="cateProps"
                    @change="handleChange">
                </el-cascader>
           </el-col>
        </el-row>

        <!-- Tab页签区域 -->
        <el-tabs v-model="activeName" @tab-click="handleClick">
            <!-- 动态参数的面板 -->
            <el-tab-pane label="动态参数" name="many">
                <!-- 添加动态参数按钮 -->
                <el-button type="primary" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加参数</el-button>
                <!-- 动态参数表格 -->
                <el-table :data="manyTableData" border stripe>
                  <!-- 展开行 -->
                  <el-table-column type="expand">
                    <!-- 循环渲染 Tag标签-->
                    <template slot-scope="scope">
                      <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                      <!-- input文本框 -->
                      <el-input
                        class="input-new-tag"
                        v-if="scope.row.inputVisible"
                        v-model="scope.row.inputValue"
                        ref="saveTagInput"
                        size="small"
                        @keyup.enter.native="handleInputConfirm(scope.row)"
                        @blur="handleInputConfirm(scope.row)">
                      </el-input>
                    <!-- 添加tag按钮 -->
                       <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                    </template>
                  </el-table-column>

                  <!-- 索引列 -->
                  <el-table-column type="index" label="#"></el-table-column>
                  <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                  <el-table-column label="操作">
                    <template slot-scope="scope">
                      <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                      <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                    </template>
                  </el-table-column>
                </el-table>
            </el-tab-pane>
            <!-- 静态属性面板 -->
            <el-tab-pane label="静态属性" name="only">
                <!-- 添加静态属性按钮 -->
                <el-button type="primary" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加属性</el-button>
                <!-- 静态属性表格 -->
                <el-table :data="onlyTableData" border stripe>
                  <!-- 展开行 -->
                  <el-table-column type="expand">
                      <!-- 循环渲染 Tag标签-->
                    <template slot-scope="scope">
                      <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                      <!-- input文本框 -->
                      <el-input
                        class="input-new-tag"
                        v-if="scope.row.inputVisible"
                        v-model="scope.row.inputValue"
                        ref="saveTagInput"
                        size="small"
                        @keyup.enter.native="handleInputConfirm(scope.row)"
                        @blur="handleInputConfirm(scope.row)">
                      </el-input>
                    <!-- 添加tag按钮 -->
                       <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                    </template>
                  </el-table-column>
                  <!-- 索引列 -->
                  <el-table-column type="index" label="#"></el-table-column>
                  <el-table-column  label="属性名称" prop="attr_name"></el-table-column>
                  <el-table-column  label="操作" >
                    <template slot-scope="scope">
                      <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                      <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                    </template>
                  </el-table-column>
                </el-table>
            </el-tab-pane>
        </el-tabs>
     </el-card>

     <!-- 添加动态和静态的对话框 -->
     <el-dialog
        :title="'添加'+titleText"
        :visible.sync="addDialogVisible"
        width="50%" @close="addDialogClosed">
        <!-- 添加动态和静态的表单 -->
        <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" >
          <el-form-item :label="titleText" prop="attr_name">
            <el-input v-model="addForm.attr_name"></el-input>
          </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
          <el-button @click="addDialogVisible = false">取 消</el-button>
          <el-button type="primary"  @click="addParams">确 定</el-button>
        </span>
     </el-dialog>

     <!-- 修改动态和静态参数的对话框 -->
     <el-dialog
        :title="'修改'+titleText"
        :visible.sync="editDialogVisible"
        width="50%" @close="editDialogClosed">
        <!-- 修改动态和静态的表单 -->
        <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px" >
          <el-form-item :label="titleText" prop="attr_name">
            <el-input v-model="editForm.attr_name"></el-input>
          </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
          <el-button @click="editDialogVisible = false">取 消</el-button>
          <el-button type="primary"  @click="editParams">确 定</el-button>
        </span>
     </el-dialog>
   </div>
</template>

<script>
export default {
  data () {
    return {
      // 商品分类数据列表
      cateList: [],
      // 级联选择框双向绑定到的数组
      selectedKeys: [],
      // 级联选择框的配置对象
      cateProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children',
        expandTrigger: 'hover'
      },
      // 被激活的页签名称
      activeName: 'many',
      // 动态数据源
      manyTableData: [],
      // 静态数据源
      onlyTableData: [],
      // 控制添加动态和静态的显示与隐藏
      addDialogVisible: false,
      // 添加参数或属性的表单数据对象
      addForm: {
        attr_name: ''
      },
      // 添加参数或属性的表单数据验证对象
      addFormRules: {
        attr_name: [
          {
            required: true,
            message: '请输入参数名称',
            trigger: 'blur'
          }
        ]
      },
      // 控制修改对话框的显示与隐藏
      editDialogVisible: false,
      // 修改参数或属性的表单数据对象
      editForm: {
        attr_name: ''
      },
      // 修改参数或属性的表单数据验证对象
      editFormRules: {
        attr_name: [
          {
            required: true,
            message: '请输入参数名称',
            trigger: 'blur'
          }
        ]
      }

    }
  },
  created () {
    this.getCateList()
  },
  computed: {
    isBtnDisabled () {
      if (this.selectedKeys.length !== 3) {
        return true
      }
      return false
    },
    // 当前选中的三级分类id
    cateId () {
      if (this.selectedKeys.length === 3) {
        return this.selectedKeys[2]
      }
      return null
    },
    // 动态计算标题的文本
    titleText () {
      if (this.activeName === 'many') {
        return '动态参数'
      }
      return '静态属性'
    }
  },
  methods: {
    // 获取所有的商品分类列表
    async getCateList () {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品列表数据失败')
      }

      this.cateList = res.data
      // console.log(this.cateList)
    },
    // 级联选择框选中项变化会触发这个函数
    async handleChange () {
    //   console.log(this.selectedKeys)
      this.getParamsData()
    },
    // 动态参数静态属性的tab时
    handleClick () {
      // console.log(this.activeName)
      this.getParamsData()
    },
    // 获取参数的数据列表(商品分类改变或者tab栏切换都需要调用)
    async getParamsData () {
      // 证明选中的不是三级分类
      if (this.selectedKeys.length !== 3) {
        this.selectedKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return
      }
      // 证明选中的是三级分类
      // console.log(this.selectedKeys)
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: this.activeName } })
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数列表失败')
      }
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(',') : []
        // 控制文本框的显示与隐藏
        item.inputVisible = false
        item.inputValue = ''
      })
      console.log(res.data)
      if (this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    // 监听添加对话框的关闭事件
    addDialogClosed () {
      this.$refs.addFormRef.resetFields()
    },
    // 点击确定按钮  完成添加参数事件
    addParams () {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return
        // 正式发起请求
        const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`, { attr_name: this.addForm.attr_name, attr_sel: this.activeName })

        if (res.meta.status !== 201) {
          return this.$message.error('添加分类参数失败!')
        }
        this.$message.success('添加分类参数成功')
        this.getParamsData()
        this.addDialogVisible = false
      })
    },
    // 修改对话框的表单重置
    editDialogClosed () {
      this.$refs.editFormRef.resetFields()
    },
    // 点击按钮 展示修改的对话框
    async showEditDialog (attrId) {
      // 查询当前参数的信息
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${attrId}`, { params: { attr_sel: this.activeName } })
      if (res.meta.status !== 200) {
        return this.$http.error('获取参数信息失败')
      }
      this.editForm = res.data
      this.editDialogVisible = true
    },
    // 点击确定按钮  完成修改参数事件
    editParams () {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return
        // 正式发起修改请求
        const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, { attr_name: this.editForm.attr_name, attr_sel: this.activeName })

        if (res.meta.status !== 200) {
          return this.$message.error('参数修改失败!')
        }
        this.$message.success('参数修改成功!')
        this.getParamsData()
        this.editDialogVisible = false
      })
    },
    // 根据id删除对应的参数项
    async removeParams (attrId) {
      const confirmResult = await this.$confirm('此操作将永久删除该文件, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      // 用户取消了删除的操作
      if (confirmResult !== 'confirm') {
        return this.$message.info('已取消删除')
      }
      // 否则就是确认删除  然后正式发起请求
      const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${attrId}`)
      if (res.meta.status !== 200) {
        return this.$message.error('删除失败！')
      }

      this.$message.success('删除成功')
      this.getParamsData()
    },

    // 文本框失去焦点  按下了enter键都会触发的事件
    async handleInputConfirm (row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      // 如果没有return 则证明输入的内容 需要做后续的处理
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      // 页面刷新 发现数据没有了 这是因为数据只在前台展示了  并没有保存到后台
      this.saveAttrVals(row)
    },

    // 点击按钮  展示文本框
    showInput (row) {
      row.inputVisible = true
      // 让文本框自动获取焦点
      // $nextTick的作用 当页面上元素被重新渲染后，才会指定回调函数中的代码
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    // 删除对应的参数可选项  也就是tag标签
    handleClose (i, row) {
      row.attr_vals.splice(i, 1)
      // 发起删除的请求
      this.saveAttrVals(row)
    },

    // 将对attr_vals的操作 保存到后台的数据库
    async saveAttrVals (row) {
      const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
        attr_name: row.attr_name,
        attr_sel: row.attr_sel,
        attr_vals: row.attr_vals.join(',')
      })
      if (res.meta.status !== 200) {
        return this.$message.error('修改参数项失败')
      }
      this.$message.success('修改参数项成功')
    }
  }
}
</script>

<style lang="less" scoped>
.cat_opt{
    margin: 15px 0;
}
.el-tag{
  margin:10px
}
.input-new-tag{
  width: 120px
}
</style>
